Add std::map benchmark

[quicknir]

I know this is primarily a hash table benchmark suite of course, so by all means feel free to close as wontfix. But it would be really cool to add std::map benchmarks to https://martin.ankerl.com/2022/08/27/hashmap-bench-01/. The exact performance trade-off between map and unordered_map would be a pretty amazing resource to be able to point people to, and these are probably some of the most thorough and respected publicly accessible container benchmarks around.